Preparation of content for multiple conditional access methods in video on demand
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United States of America Patent
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Nov 17, 2009
Grant Date -
May 5, 2005
app pub date -
Mar 16, 2004
filing date -
Nov 3, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method of processing content in a video on demand (VOD) system consistent with certain embodiments of the invention, wherein the content is identified by a first set of packet identifiers (PIDs), involves receiving content, the content having marked packets designating packets that are to be encrypted by a first encryption system by setting an encryption flag for all packets designated to be encrypted. Packets are selected in the content according to a selective encryption selection criterion to produce selected packets. The selected packets are duplicated to produce duplicate copies of the selected packets and these duplicate copies are identified using a second set of PIDs. The duplicate copies identified by the second set of PIDs are inserted into the content. All encryption flags in the content are cleared except for the selected packets having the first set of PIDs, so the encryption to follow is selective. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.
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